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DEP WTC General Correspondence Form

Machine-extracted title · confidence 70%

Generic form or header page from the Department of Environmental Protection regarding general World Trade Center notices and requests.

NYC-WTC_000149798–000149882

Folder label: “GENERAL 2

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co oo Nearest Neighbor Analysis o' "0 o

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• The observed nearest neighbor distance (NNd) is the average distance between each exceedance events and its closest neighbor (i.e., another exceedance event). • Nearest neighbor index (NNI) = NNd / E[NNd] • Test for significance of the NNd by simulation - 9,999 patterns for the test only and clean and test PCMe exceedances were created; NNds were calculated for each - Compared the observed NNds to the simulated NNds - Two-sided test: reject null hypothesis of spatial randomness if the observed NNd is much smaller (clustering) or larger (dispersion) than most of the simulated NNds SRC^ www.syrres.com

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NYC-WTC_000149827Source: NYC Law Department, mirrored locally

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